Troubleshooting The Cooling System On The M40E Router; Figure 77: Fuse Locations In The Fuse Box - Juniper M40E Hardware Manual

M40e Multiservice Edge Router Hardware Guide
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Troubleshooting the Cooling System on the M40e Router

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Figure 77: Fuse Locations in the Fuse Box

When a fuse has blown but the power supplies are still delivering power to router, the
yellow LED adjacent to the fuse lights. For vertically oriented fuses (in the groups labeled
J241 through J244 in Figure 77 on page 150), the LED is located below the fuse; for
horizontally oriented fuses (in the group labeled
NOTE: The LEDs are each about 0.1in. (2 mm) square. They might be difficult
to see when not lit.
A blown fuse can cause a component to fail even though it is correctly installed and the
power supplies are functioning. Check for a blown fuse in the following circumstances:
The LED that indicates normal operation for the component fails to light.
The appropriate CLI
show chassis environment
is installed but is not receiving power.
Connecting the M40e Router to Management and Alarm Devices on page 111
Replacing a Fuse on an M40e Router on page 222
General Electrical Safety Guidelines and Warnings Electrical Codes for M Series, MX
Series, and T Series Routers on page 251
M40e Router LED Overview on page 146
M40e Chassis and Interface Alarm Messages on page 147
Contacting Customer Support on page 307
The cooling system is not functioning normally.
The router's cooling system comprises separate front and rear subsystems:
The router's cooling system comprises separate front and rear subsystems:
The front subsystem includes the fan tray located behind the cable management
system and the impeller located behind the craft interface. They cool the FPCs, PICs,
and midplane. See "M40e Chassis Description" on page 8.
J240 ), it is to the left of the fuse.
command indicates that the component
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